Along the side exhaust systems are cool to look at but....
problems to be aware of
Safety issue....they get very hot and can cause burns on your legs, etc....unless they have a heat shield of some sort..
Can discolor and if cheaply made corrode/rust, etc...
They will get damged, dented, scratched by rocks, etc...from the tires.....
I would suggest going to a custom exhaust shop in your area (ask the hot rodder's they all know where they are) and have a custom system made to exhaust out the side instead of along the side...I suggest going with stainless. Will last forever.
I went that route....looks and works great...
(again just another opinion)